RozhankovskayaM. I., and SyavavkoM. S. “Transformation of Formal Expansions of Solutions of Linear Differential Equations in a Parameter into Continued <em class="a-Plus-plus">RITZ</Em&gt;-Fractions”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 5 (May 25, 1998): 679–686. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4906.